Los Angeles Math Circle 
4/27: Probability in Action (Andrea Brose)Paradoxes! Paradoxes: well known ones such as the famous Monty Hall, Birthday, DaughterSons, Socks and Murder Problems, to lesser known ones.
(You flip three nickels, at least two land with the same side up, and there is a 5050 chance that the third shows Thomas Jefferson or his Monticello. Thus P(all nickels land with the same side up)=0.5, right?)
